Patent
Intranetwork code division multiple access communication system
Frank M. Torre,John F. Courtien +1 more
- 21 Mar 1985
49
TL;DR: In this article, a pseudorandom noise generator synchronized to the clock is gated with coded data pulsed with appropriate jitter insertion and transmitted over a frequency determined by the pseudoorandom number at any instant in time.
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Abstract: A CDMA format is used within a network to permit communication between members of a network. Network members are synchronized to each other and are each aware of a predetermined set of code words which has been established. A member desiring to transmit data selects a code word from the predetermined set. If there are unused code words, one of the unused words is randomly selected. If all words are being used, the code word of the farthest user is selected. Since all members are synchronized in time to stable clocks, the range of each user is known. All members of the network are always listening and keeping track of detections of other users and code words. Transmitted signals are a series of pulses with a jitter or sync pulse inserted within each series. The number and location of sync pulses is unique for each code and defines the CDMA code of the signal. A pseudorandom noise generator synchronized to the clock is gated with coded data pulsed with appropriate jitter insertion and transmitted over a frequency determined by the pseudorandom number at any instant in time.
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Citations
Patent
System and method for generating signal waveforms in a CDMA cellular telephone system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Lindsay A. Weaver,Wheatley Charles E,Andrew J. Viterbi +5 more
- 21 Jun 1991
TL;DR: In this paper, a system and method for communicating information signals using spread spectrum communication techniques is presented, where PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance.
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Patent
Spread spectrum multiple access communication using satellite or terrestrial repeaters
Gilhousen Klein S,Irwin M. Jacobs,Weaver Lindsay A +2 more
- 15 Oct 1987
TL;DR: In this article, a multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals is presented.
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Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
Eric Paneth,Mark J Handzel,Steven Allan Morley,Graham M Avis +3 more
- 25 Apr 2002
TL;DR: In this article, a system and method for wireless communication between a plurality of subscriber units and a base station, the base station communicating information signals from an originating source to a destination subscriber unit over a channel at an assigned one of a plurality OF frequencies using repetitive time frames, each said time frame comprising a sequence of time slots.
877
Patent
Integrated cellular communications system
Albert John Mallinckrodt
- 19 Mar 1991
TL;DR: In this article, a CDMA spread spectrum cellular communications system with both surface and satellite nodes and using forward error correction coding, to enhance effective gain and selectivity, is provided.
474
Patent
CDMA subtractive demodulation
Paul W. Dent
- 12 Dec 1991
TL;DR: Subtractive CDMA demodulation optimally decodes a coded information signal embedded in many other overlapping signals making up a received, composite signal as mentioned in this paper, and after each information signal is successfully decoded, it is recoded and removed from the composite signal.
362
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Patent
Asynchronous communications system
Toshiharu Aoki,Hiroshi Inose +1 more
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TL;DR: An asynchronous communication system for mobile and fixed radio communications which includes a plurality of subscriber's stations, a plurality-of-trains and a central station, in which the subscriber's speech and associated audible signals are first modulated into three-level delta modulation pulses, then coded into a frequency-time address assigned to those subscribers, transmitted by radio, received by one of the nearby trunk stations, address decoded first to identify the subscriber, then demodulated to voice band signals, transmitted to the central office having stored program control features, switched in accordance with the dialed
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